Adding a DR member to a mirror get "Missing Mirrored Databases Report"

Hi, 

I'm trying to add a DR async member to a mirror but when I add this member I get this messages in the mirror monitor (on the DR member):

The message im talking about is the "missing Mirrored Databases report".

The only step I did was the " System Administration -> Configuration -> Mirror Settings -> Join as Async" an fill the blanks. Maybe Im skipping a step? 

I dont get how to make this DBs start getting synchronized, the cconsole log dont show nothing 

Thanks a lot!!!